On Tue, Dec 12, 2017 at 10:00:08AM -0800, Andy Lutomirski wrote: > On Tue, Dec 12, 2017 at 9:32 AM, Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote: > > From: Peter Zijstra <peterz@xxxxxxxxxxxxx> > > > > In order to create VMAs that are not accessible to userspace create a new > > VM_NOUSER flag. This can be used in conjunction with > > install_special_mapping() to inject 'kernel' data into the userspace map. > > > > Similar to how arch_vm_get_page_prot() allows adding _PAGE_flags to > > pgprot_t, introduce arch_vm_get_page_prot_excl() which masks > > _PAGE_flags from pgprot_t and use this to implement VM_NOUSER for x86. > > How does this interact with get_user_pages(), etc? gup would find the page. These patches do in fact rely on that through the populate things. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
